drivers/soc/fsl/qe/qe_ports_ic.c

Source file repositories/reference/linux-study-clean/drivers/soc/fsl/qe/qe_ports_ic.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/fsl/qe/qe_ports_ic.c
Extension
.c
Size
3363 bytes
Lines
151
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct qepic_data {
	void __iomem *reg;
	struct irq_domain *host;
	int irq;
};

static void qepic_mask(struct irq_data *d)
{
	struct qepic_data *data = irq_data_get_irq_chip_data(d);

	clrbits32(data->reg + CEPIMR, 1 << (31 - irqd_to_hwirq(d)));
}

static void qepic_unmask(struct irq_data *d)
{
	struct qepic_data *data = irq_data_get_irq_chip_data(d);

	setbits32(data->reg + CEPIMR, 1 << (31 - irqd_to_hwirq(d)));
}

static void qepic_end(struct irq_data *d)
{
	struct qepic_data *data = irq_data_get_irq_chip_data(d);

	out_be32(data->reg + CEPIER, 1 << (31 - irqd_to_hwirq(d)));
}

static int qepic_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct qepic_data *data = irq_data_get_irq_chip_data(d);
	unsigned int vec = (unsigned int)irqd_to_hwirq(d);

	switch (flow_type & IRQ_TYPE_SENSE_MASK) {
	case IRQ_TYPE_EDGE_FALLING:
		setbits32(data->reg + CEPICR, 1 << (31 - vec));
		return 0;
	case IRQ_TYPE_EDGE_BOTH:
	case IRQ_TYPE_NONE:
		clrbits32(data->reg + CEPICR, 1 << (31 - vec));
		return 0;
	}
	return -EINVAL;
}

static struct irq_chip qepic = {
	.name = "QEPIC",
	.irq_mask = qepic_mask,
	.irq_unmask = qepic_unmask,
	.irq_eoi = qepic_end,
	.irq_set_type = qepic_set_type,
};

static int qepic_get_irq(struct irq_desc *desc)
{
	struct qepic_data *data = irq_desc_get_handler_data(desc);
	u32 event = in_be32(data->reg + CEPIER);

	if (!event)
		return -1;

	return irq_find_mapping(data->host, 32 - ffs(event));
}

static void qepic_cascade(struct irq_desc *desc)
{
	generic_handle_irq(qepic_get_irq(desc));
}

static int qepic_host_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw)
{
	irq_set_chip_data(virq, h->host_data);
	irq_set_chip_and_handler(virq, &qepic, handle_fasteoi_irq);
	return 0;
}

static const struct irq_domain_ops qepic_host_ops = {
	.map = qepic_host_map,
};

static void qepic_remove(void *res)
{
	struct qepic_data *data = res;

	irq_set_chained_handler_and_data(data->irq, NULL, NULL);
	irq_domain_remove(data->host);
}

static int qepic_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

Annotation

Implementation Notes